Abstract
A position-determining device has been developed for studying neutron emission in fission processes. The detector essentially consists of two photomultipliers at the ends of a cylinder of NE213 liquid scintillator (about 82 cm in length and 3 cm in diameter), yielding a position resolution of 8 cm and a time resolution of 1.2 ns for 3 MeV neutrons. The quality of the performance is illustrated by measuring the velocity and angular distributions of neutrons associated with the fission fragments from spontaneous fission of 252Cf. The experimental setup, adaptable for use with other neutron emitting fragments (e.g. heavy-ion reaction products), consisted of the position-sensitive n-detector, a thin scintillator film, and a solid-state detector.
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